Finding the Fourth Proportional to 21,097.80, 29,111.40 and 13,142.52

Step by Step Solution

1. Step 1: Write the proportion equation
   21,097.80 : 29,111.40 = 13,142.52 : x
2. Step 2: Convert to fraction form
   21,097.80/29,111.40 = 13,142.52/x
3. Step 3: Cross multiply
   21,097.80x = 29,111.40 × 13,142.52
4. Step 4: Simplify right side
   21,097.80x = 382,597,156.73
5. Step 5: Solve for x
   x = 382,597,156.73/21,097.80
6. Step 6: Final answer
   x = 18,134.46